add: Dockerfile for Bonus Drop 101

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+# Restring Dockerfile
+
+This directory contains a `Dockerfile` for the [Restring](https://github.com/likang/restring) web app.
+
+Clone the repo, put this file in there and do:
+
+```bash
+$ docker build -t restring .
+$ docker run -d -p 3001:80 --name restring-web restring
+```
+
+Use any free port instead of `3001`.